M87C257 STMICROELECTRONICS [STMicroelectronics], M87C257 Datasheet - Page 7

• Manufacturer Part Number: M87C257
• Description: ADDRESS LATCHED 256K 32K x 8 UV EPROM and OTP EPROM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Table 9. Programming Mode DC Characteristics
(T
Note: 1. V
Table 10. Programming Mode AC Characteristics
(T
Note: 1. V
Programming
When delivered (and after each erasure for UV
EPROM), all bits of the M87C257 are in the "1"
state. Data is introduced by selectively program-
ming "0"s into the desired bit locations. Although
only "0"s will be programmed, both "1"s and "0"s
can be present in the data word. The only way to
Symbol
Symbol
A
A
t
t
t
t
t
t
t
t
t
VPHEL
VCHEL
t
GHQZ
V
EHQX
QXGL
GLQV
GHAX
V
QVEL
ELEH
= 25 C; V
= 25 C; V
AVEL
I
V
V
I
V
I
CC
PP
LI
OH
OL
IH
ID
IL
CC
CC
must be applied simultaneously with or before V
must be applied simultaneously with or before V
Input Leakage Current
Supply Current
Program Current
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage TTL
A9 Voltage
t
t
t
t
t
Alt
t
t
t
OES
t
t
VPS
VCS
DFP
PW
DS
DH
OE
AH
AS
CC
CC
= 6.25V
= 6.25V
Address Valid to Chip Enable Low
Input Valid to Chip Enable Low
V
V
Chip Enable Program Pulse Width
Chip Enable High to Input Transition
Input Transition to Output Enable Low
Output Enable Low to Output Valid
Output Enable High to Output Hi-Z
Output Enable High to Address Transition
PP
CC
Parameter
High to Chip Enable Low
High to Chip Enable Low
0.25V; V
0.25V; V
Parameter
PP
PP
= 12.75V
= 12.75V
PP
PP
and removed simultaneously or after V
and removed simultaneously or after V
Test Condition
0.25V)
V
0.25V)
I
I
IL
(1)
OL
OH
(1)
E = V
= 2.1mA
change a "0" to a "1" is by die exposition to ultra-
violet light (UV EPROM). The M87C257 is in the
programming mode when V
is at V
programmed is applied to 8 bits in parallel to the
data output pins. The levels required for the ad-
dress and data inputs are TTL. V
be 6.25 V
= –1mA
V
IN
IL
V
IH
IH
Test Condition
and E is pulsed to V
0.25 V.
V
CC
–0.3
Min
11.5
2
-0.8V
PP
PP
.
V
PP
Min
CC
95
2
2
2
2
2
2
0
0
Max
12.5
0.8
0.4
input is at 12.75V, G
50
50
10
+ 0.5
IL
. The data to be
CC
Max
105
100
130
is specified to
M87C257
Unit
mA
mA
V
V
V
V
V
A
Unit
ns
ns
ns
s
s
s
s
s
s
s
7/13